how to modify a CSL like this?
when i add citations in WORD, i hope they look like this:
https://s3.amazonaws.com/zotero.org/images/forums/u11304179/ci05nzkwl581v7gkfu5y.png
https://s3.amazonaws.com/zotero.org/images/forums/u11304179/ci05nzkwl581v7gkfu5y.png
https://www.zotero.org/styles?format=numeric&dependent=0
But that specific behaviour you won't be able to achieve.
You might be able to achieve the in-text numbering if you cite different duplicate Zotero records but you would nonetheless need to do extensive editing of the bibliography once you have finished and flattened your document Zotero fields.
edit: Do you want to never reuse a number no matter how many times an item is referenced?